If everybody's doing it, sooner or later someone had to start singing about it. Silk started as romantic crooners who used four-part harmonies to express longing and love. Eventually they became silky-voiced rhapsodists whose lyrics could make Marvin Gaye blush. There's no denying their vocal abilities are above par, and with music that oozes brazen sexuality, they come off like a team of scientists testing the power of aural Spanish fly. Lovers around the world now have room for something other than oysters in their refrigerators.